Can a Chinese friend send you an Invitation letter for tourism purpose?

Yes, the applicant can apply for a tourist type with the invitation letter fom Chinese citizen. Unfortunately, Pakistanis can't apply for individual tourist types according to Chinese embassy. If you plan to visit China, then you should join a group tour arranged by qualified travel agencies who can take care of your group L application.

Thanks
So what would i require from chinese friend for invitation letter?

Dear, if the travel agency handle the visa application for you, you don't need to get this invitation letter.